4431698644 has 6 divisors (see below), whose sum is σ = 7755472634. Its totient is φ = 2215849320.

The previous prime is 4431698639. The next prime is 4431698659. The reversal of 4431698644 is 4468961344.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4415602500 + 16096144 = 66450^2 + 4012^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 553962327 + ... + 553962334.

Almost surely, 2^4431698644 is an apocalyptic number.

It is an amenable number.

4431698644 is a deficient number, since it is larger than the sum of its proper divisors (3323773990).

4431698644 is a wasteful number, since it uses less digits than its factorization.

4431698644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107924665 (or 1107924663 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 49.

The square root of 4431698644 is about 66571.0045289990. The cubic root of 4431698644 is about 1642.5681857052.

The spelling of 4431698644 in words is "four billion, four hundred thirty-one million, six hundred ninety-eight thousand, six hundred forty-four".